As will define computer is an electronic device that aspect data processing the data througth the C P U (CENTRAL PROSESSING UNIT) and give out information througth and output unit .
A computer is useful when it is able ro communicate with the external enviroment .
When you work with computer you feed your data and instruction through some devices to the computer.this devices are called input devices.
More over computer, after processing gives output through other devices called output devices.
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From @yetunde